Laminated-type battery and method for manufacturing the same

Abstract

There is provided a laminated-type battery prevented from short-circuit between a positive electrode and a negative electrode, suppressed in a local increase in the thickness of the battery, and high in electric properties and the reliability. The laminated-type battery includes a battery element having at least two sheets of first-polarity electrodes each laminated with a second-polarity electrode with a separator therebetween, wherein the first-polarity electrode includes an electrode section having an active material layer formed on a current collector, a lead section having no active material layer formed on the current collector, and an insulating layer disposed over from the active material layer to an active material layer-non-formed region on a boundary region of the electrode section and the lead section, wherein the insulating layer of the one first-polarity electrode and the insulating layer of the another first-polarity electrode are formed at least partly on different positions as viewed in the lamination direction.

1 . A laminated-type battery, comprising a battery element having at least two sheets of first-polarity electrodes each laminated with a second-polarity electrode with a separator therebetween,
 wherein the first-polarity electrode comprises: an electrode section having an active material layer formed on a current collector; a lead section having no active material layer formed on the current collector; and an insulating layer disposed over from the active material layer to an active material layer-non-formed region on a boundary region of the electrode section and the lead section,   wherein the insulating layer of the one first-polarity electrode and the insulating layer of the another first-polarity electrode are formed at least partly on different positions as viewed in the lamination direction.   
     
     
         2 . The laminated-type battery according to  claim 1 , wherein in the first-polarity electrodes, a superposed width of regions where the insulating layers are formed is small as compared with a superposed width of ends of the lead sections as viewed in the lamination direction. 
     
     
         3 . The laminated-type battery according to  claim 1 , wherein the first-polarity electrode has a notch portion in at least a part of the region where the insulating layer is formed. 
     
     
         4 . The laminated-type battery according to  claim 3 , wherein the first-polarity electrodes have the notch portions, and the notch portions have two or more types of shapes. 
     
     
         5 . The laminated-type battery according to  claim 3 , wherein when all the notch portions are superposed in the lamination direction of the battery element, the notch portions entirely cover active material layer-formed regions having the insulating layer formed before notching as viewed in the lamination direction. 
     
     
         6 . The laminated-type battery according to  claim 3 , wherein the notch portion is provided in at least a part of a region where the insulating layer and the active material layer are formed. 
     
     
         7 . The laminated-type battery according to  claim 3 , wherein the battery element further comprises the first-polarity electrode having no notch portion. 
     
     
         8 . The laminated-type battery according to  claim 1 , wherein the insulating layer is at least one selected from the group consisting of adhesive tapes, heat fusing tapes, and layers formed by coating and drying a liquid comprising an insulating material. 
     
     
         9 . The laminated-type battery according to  claim 1 , wherein the first-polarity electrode is a positive electrode, and the second-polarity electrode is a negative electrode. 
     
     
         10 . The laminated-type battery according to  claim 1 , wherein the first-polarity electrode has a hole in at least a part of the region where the insulating layer is formed. 
     
     
         11 . The laminated-type battery according to  claim 1 , comprising a battery element comprising at least three sheets of the first-polarity electrodes each laminated on the second-polarity electrode with the separator therebetween. 
     
     
         12 . The laminated-type battery according to  claim 1 , wherein the second-polarity electrode is folded while the second-polarity electrode alternately interposes the first-polarity electrode and the separator therebetween. 
     
     
         13 . The laminated-type battery according to  claim 1 , wherein the separator is folded while the separator alternately interposes the first-polarity electrode and the second-polarity electrode therebetween. 
     
     
         14 . The laminated-type battery according to  claim 1 , wherein the laminated-type battery is a lithium ion secondary battery, a nickel hydrogen battery, a lithium ion capacitor, a nickel cadmium battery, a lithium metal primary battery, a lithium metal secondary battery or a lithium polymer battery. 
     
     
         15 . The laminated-type battery according to  claim 1 , wherein the battery element comprises at least two sheets of the second-polarity electrodes,
 wherein the second-polarity electrode comprises: an electrode section having an active material layer formed on a current collector; a lead section having no active material layer formed on the current collector; and an insulating layer disposed over from the active material layer to an active material layer-non-formed region on a boundary region of the electrode section and the lead section,   wherein the insulating layer of the one second-polarity electrode and the insulating layer of the another second-polarity electrode are formed at least partly on different positions as viewed in the lamination direction.   
     
     
         16 . A laminated-type battery, comprising a battery element having at least two sheets of first-polarity electrodes each laminated on a second-polarity electrode with a separator therebetween,
 wherein the first-polarity electrode comprises: an electrode section having an active material layer formed on a current collector; a lead section having no active material layer formed on the current collector; and an insulating layer disposed over from the active material layer to an active material layer-non-formed region on a boundary region of the electrode section and the lead section,   wherein the insulating layer of the one first-polarity electrode and the insulating layer of the another first-polarity electrode are formed at least partly on different positions as viewed in the lamination direction, and   wherein the formation of the insulating layers at least partly on the different positions reduces a thickness of a laminated portion of the insulating layers.   
     
     
         17 . A method for manufacturing a laminated-type battery, comprising:
 forming an active material layer on a surface of a current collector to thereby obtain an electrode comprising an electrode section having the active material layer formed on the current collector and a lead section having no active material layer formed on the current collector;   forming an insulating layer over from the active material layer to an active material layer-non-formed region on a boundary region of the electrode section and the lead section of the electrode to thereby obtain a first-polarity electrode;   notching at least a part of a region of the first-polarity electrode where the insulating layer is formed to thereby form a notch portion; and   laminating at least two sheets of the first-polarity electrodes each with a second-polarity electrode with a separator therebetween,   wherein the insulating layer of the one first-polarity electrode and the insulating layer of the another first-polarity electrode are formed at least partly on different positions as viewed in the lamination direction.